label fatdog-multi
linux vmlinuz
initrd initrd
append savefile=direct:multi:sr0 base2ram=yes waitdev=0
menu label Fatdog64 with multisession support
text help
Start Fatdog with multisession support for the first optical disc drive.
Upon startup, previous sessions (if any) will be loaded from the disc.
After shutdown, changes will be saved as a new session to the disc.
You should use BD-RE as the disc media.
endtext

Ted Dog, does it still work if you change iso-level to 4 instead of 3?

can not find info on level 4 with iso9660

is level 4 ISO13490/ECMA-168?

No, when you use the iso-level setting of "4", mkisofs actually use iso9660:1999 specification. This is the "supposedly" proper way to use -D (ref: http://linux.die.net/man/8/mkisofs). I can confirm that if you use this setting, the disc is readable fine under Windows XP. The question is whether it can still burn > 4GB files and whether there are any specific bluray stuff that fails.

I've tested removing the -J (change it to -D) and changing iso-level to 4 for all the 3 possible places:
- save multisession
- remaster
- iso builder
and I have tested saving session under these conditions, it seems to work fine._________________Fatdog64, Slacko and Puppeee user. Puppy user since 2.13.
Contributed Fatdog64 packages thread.

Growisofs has a calculation bug that effects multisession being written somewhere near the 10G mark.
This is not a limit on these settings, to prove that I added files to a directory inside the directory holding the files needed to boot FatDog64 those added files totaled 22G with one over 10G in size.

Of course I had to use a USB harddrive, not build from RAM for that test.

This is my method of backing up large stuff, Organize files into directories to 22G limit. by moving stuff rather than copying.

I see. So does using iso-level setting of "4" instead of "3" still work? Because like you say above, it seems that the only thing that needs to be changed is:
a) drop -J
b) add -D
I've done both a) and b), but in addition to that I'm changing iso-level from "3" to "4", so I wonder whether it still work? The manpage doesn't exactly say that iso9660:1999 relaxes the size restriction of earlier iso9660 spec (which "iso-level 3" does).

As for why it doesn't work for others puppies (including earlier Fatdogs), is probably because in 620 we now use the latest cdrtools (earlier Fatdogs uses cdrkit - a fork of cdrtools which seems to be no longer updated after 2010). I think many puppies (with the exception of Slacko) perhaps still use cdrkit.

No, when you use the iso-level setting of "4", mkisofs actually use iso9660:1999 specification. This is the "supposedly" proper way to use -D (ref: http://linux.die.net/man/8/mkisofs). I can confirm that if you use this setting, the disc is readable fine under Windows XP.

I can also confirm that "-D -iso-level 4" is a replacement for "-J" in XP and Win7. This is both when writing directly to a data DVD and making an ISO to burn data onto a CD.

This argument throws a warning message about filenames longer than 31 characters, but it doesn't appear to be a problem.

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